Gitea #2: the site is now public (INVITE_REQUIRED=false), so the
alpha-status clause and invite-code registration requirement no longer
apply and are removed. Hardens the remaining terms: age/capacity
requirement, DSA host-provider privilege with a notice-and-action
section referencing the existing report feature, a proportionate
suspension clause, a limited-liability clause based on the
unentgeltliche-Nutzung privilege (§§ 521, 599, 690 BGB), a
§308-Nr.5-BGB-compliant change clause with objection period, an EU
consumer-protection carve-out, and a severability clause.